Hydraulic actuating mechanism for machining implements



Jan. 15, 1952 R. G. HALL ETAL HYDRAULIC ACTUATING MECHANISM FOR MACHINING IMPLEMENTS 4 Sheets-Sheet 2 Original Filed July l0, 1948 2 O O O O m MZ M @o M2 M w.

INVENTORS. @d o//OUQ/ G. Hcd/ BY Siem/Uri /7. /v//Y/ Jan. l5, 1952 R. G. HALL ETAL HYDRAULIC ACTUATING MECHANISM FOR MACHINING IMPLEMENTS 4 Sheets-Sheet 5 Original Filed July l0, 1948 n) /435 @i .fa

Jan- 15, 1952 F. G. HALL ETAL 2,582328 HYDRAULIC ACTUATING MECHANISM FOR MACHINING IMPLEMENTS Original Filed July l0, 1948 4 Sheets-Sheet 4 F JNVENToRs.

1Q am, PO//a/m/ 6. Haz/f BY @Zen/arf M/v/M/ idw; M

Patented Jan. 15, 1.952Y

HYDRAULIG AGT-U'ATING MECHANISM JFGR VMACHINING IBIPLEMENT S Rolland Gr-v Hall, Yalesville, Conni, and 'Stewart lVL Hill, Sherrill, N.` Y assignors 't0 RiW'lilow & Sons Manufacturing Company, Walling-v ford, Conn., a corporation v Qriginal, application July ,lflfir Serial Nef 38,066- Dividd and this application March '11.1. 195.0,Serial NQ- 1459J126 11 Claims, l

This invention relates to apparatus for nishing opposite surfaces or yedges of manufactured articles, and more especially, though not exclusively, to apparatus for trimming and/or -buiiing the opposite-edges of table atware, such as Vthe customarily butt-joined side yedges lof knife handles, for instance.

This application is a division of our co-pending application Serial No. 38,066, filed yJuly 10, 1948, which Aissued as Patent No. 2,576,781 on Novemper 27, 1951.

It is the primary aim anjd object ofthe present invention to provide apparatus o f this type which will automatically perform simultaneously on a large number of videntical articles, such as knife handles, for instance, and which has operating cycles of predetermined duration that are started on'momentary manipulation by an operator of a control element of the apparatus.

lt is another object of the present invention ment of the workY to be operated onin transversev directions between the fast spinning operating .vheels, so as 4to obtain optimum performanceof these wheels on the Work during an operati-ng cycle of minimum duration.

`lt is another important object of thevpresent invention to operate the present apparatus principally hydraulically for attaining simplicity of construction of the apparatus, and accomplishing its eiilcient operation with a minimum number of movable parts and a minimum of wear petween'the parts.

The above and other objects, features and ad-Y vantages of the present invention will be more fully understood from the following description considered in connection with the accompanying illustrative drawings.

In the drawings:

Fig. -1 is a front elevation of apparatus embodythe lpresent invention;

Fig. 2 is a side elevation, partly in section, of the apparatus, as viewed in the direction of the arrow 2 in Fig. l;

` to provide apparatus of this `type in -which'dur- Figs. 3 and -4 are vertical `sections through the apparatus, taken substantially-'0n lthe lines 3--3 ande-"4, respectively, of'Fig. 1;-

Fig. `5 is a fragmentary section ythrough the' apparatus, taken substantially on the line 5-5 of Fig. 4;

Fig. 6 is aV fragmentary section taken `on the line=6-6 of Fig. 1

F-ig. 'l shows diagrammatically, inside elevation, ycertain cooperating parts -ofothe lappalati;s shown in Fig. 3;

Fig. 8 is a plan view of 'the Yparts shownin Fig. rl;

Figs. 9 and li) are views similarto Eig.- fi, but

tion, `Vit may :be'stated in advance that `the presenty apparatus is so constructed as to be adaptable for Ytrimming operation or 4for vpulling frope'ration, or both.

The instant apparatus comprises Va pase fra-me 30 which is in the -`:form of a housing having Vva front wall 32, sidewalls 34, and a rear Wal-11236 which leaves an epening 3g the rear of the frame for ready access to the interior thereof. The front and rear `walls 32 and-36 .arelined at'the top with-anglesll (Figs. 3 and4) onwhleh is mounted in anysuitable manner a 'platform 42. The side walls 3:4 yof 'the base frame 30 may also be provided 4at the top withA inwardly extending flangesV 44 (Fig. 5) whichA serve as additional mountings `for the platform 42. Mounted in and on the `lease virai-ne' 3 0 are, l as lhereir-iafter described, the operating wheels Aand their respective-drives B (Figs. 3, 4 `and 5). lolted at lEll,lgrfotherwise secured, to the oppesiteside wallsi34 of the base frame'ilil'are standards 52, respectively, whiohare joined atthe top by a brace 54 inthe form foffa plate that may be connected with the standards 52 by angles 56 (Figs. 4 and -6). Mounted on the braced standards 5g are, as hereinafter described, a work carrier 'C (Figs. A1 and -4) carrier operating devicesD (Figs, land 4), controlsi 3 for the operating wheels (Fig. 2) and a hydraulic control system F (Fig. 1)

Operating wheeZsA mounted on a shaft 02, and are preferably ce.

mented together in their side-by-side relation so as to constitute a fairly rigid wheel. If the wheels 50 are to be used for trimming purposes, their peripheries are preferably coated with a grinding compound which lasts for a considerable number of trimming cycles of the apparatus before recoating is required. If the wheels 60 are to be used for buiing purposes, there is applied a buiing compound to their peripheries preferably at the start of each buinglcycle of the apparatus.

Journaled in suitable bearing brackets on the base frame 30 are two counter shafts 12 (Figs. 5 and 6), each of which carries near its ends arms 14 that extend through transverse slots 16 in the platform 42 of the base frame 30 (Figs. 3 and 5). The arms 14 on each shaft 12, together with removably mounted caps 18 thereon, pro-I vide spaced journal bearings for the shaft 62 of an operating wheel 60. The shafts 12 are rocked in opposite directions so as to swing the operating wheels 60, in the course of their performance, to and from each other in a manner and by means hereinafter described. The peripheries of the wheels 60 extend into the interior of the base frame 30 through a cutout 4| in the platform 42, said cutout 4| being of sucient width (Fig. 4) to permit the abovementioned swinging motions of the wheels 60. Since the wheels 60 perform an abrading operation regardless of whether they are used for trimming or for buiing, there is provided underneath these wheels pan 80 (Figs. 5 and 6), which is suitably secured to the platform 42, and receives all waste matter dropping from the work and from the wheels 60. The pan 80 has at the rear of the apparatus an outlet 82 which may, through a suitable conduit (not shown), communicate with any conventional suction device for drawing the accumulated waste matter from the pan 80. Suitably hinged at 84 on the platform 42 are guards 30 over the exposed peripheries of the wheels 60 (Fig. 4), these guards serving not only to keep the operators hands from the wheels 60, but also to direct all Waste matter from the work and operating wheels into the pan 80 provided therefor.

Wheel drives B Two opposed ends of the shafts 62 of the operating wheels 60 extend beyond the adjacent sides of the base frame 30 and there carry pulleys 90, respectively (Fig. 1). The pulley 90 on the rear wheel 60 (Figs. 4 and 5) is drivingly connected by belts 92 with a pulley 94 on the shaft 95 of an electric motor 98 which is suitably mounted on a bracket |00 that is, in turn, mounted for v consequence, swinging the motor-carrying bracket |00 on its pivot axis |02. The pulley 90" on the front wheel 50 is drivingly connected by belts |20 with a pulley |22 on the shaft |24 of another electric motor |26 which, as shown in Fig. 3, is carried by a mounting bracket |28, journaled at |30 in a bearing bracket |52 on the rear wall 36 of the base frame 30. Swivelled in an upward extension |34 of the mounting bracket |23 is the shank |35 of a nut |30 which is in threaded engagement with a spindle |35 that has any conventional universal mounting in .a bracket on the rear wall 55 of the base frame 30 and carries a hand wheel |42, the latter to be manipulated for regulating the tension of the belts |20, as will be readily understood. Thus, the wheels 60 are individually driven from their respective motors 98 and |25, in opposite directions, and more particularly in the direction of the arrows |46 and |48, respectively, in Fig. 4.

Work carrier C Referring now more particularly to Fig. 1, the work carrier comprises, in the present instance, a vertically reciprocatory frame |50 and an oscillatory frame |52. The reciprocatory frame |50 comprises opposite sliding brackets |54 and |55 and connecting cross bars |50. The brackets |54 and are slidable on vertical guide posts |55 and |51, respectively, which are mounted on the adjacent standards 52, respectively, through intermediation of mounting brackets (Figs. 1 and 3). Thus, the sliding brackets |54, |55 and the connecting cross bars |55 form a single unit which is vertically reciprocable on the guide posts |55 and |51.

The oscillatory frame |52 comprises side members |02 and connecting cross bars |54, which together form a single unit. The side members |52V are received for sliding movement on the cross bars |58 of the reciprocatory frame |50, thus permitting oscillation of the fra-me |52 on the other frame |50 transversely of the direction of reciprocation of the latter frame.

Preferably, there are interposed between the slides |54 and |55 and the adjacent brackets |50, respectively, bellows |50 of rubber or the like which surround the guide posts |55 and |51, respectively, and contract and expand on reciprocation of the frame |50, as will be readily understood. These bellows |58 protect the guide posts |55 and |51 from dust and other foreign matter. The length of the guide post |55 between the later lugs |10 of the slide |54 is also protected from dust and other foreign matteiby a sleeve |12 which surrounds post |55 and is interposed bethe belts 92 may be regulated by turning the rp.

hand wheel ||4 in the proper direction and, in

tween the lugs |10 in the manner best shown in Fig. 1. Those portions of the cross bars |523 of the frame |50 on which the side members |52 of the oscillatory frame |52 oscillate, are preferably also protected from dust and other foreign matter by contractable and expansible bellows |14 which are suitably anchored with their ends on the cross bars |58 and on the adjacent side members |52, respectively.

The present apparatus is also equipped with one or more detachable work racks |00 (Fig. 4). The work rack |05 is in the form of a U-shaped bar having opposite legs |32 and a connecting yoke |04. The legs |82 of the work rack are provided with elongated slots |80 (Fig. 4) by means of which the work rack is suspended from headed pins |30 on the lower ends of the side members |52 of the oscillatory frame |52, all as shown more clearly in our aforesaid co-pendi cured :in the yoke |04 of the work rack |80 are a'multiplicity of blades |95 which serve as holders for the knife handles lc to be operated on. `More particularly, the knife handles are inserted over the blades |38 (Fig. 4) and are held thereoninupright position. When suspended from the oscillatory frame |52, as described, the work rack |80 is located in the median :vertical plane between `the wheels V60 as shown `in- Fig. V4, so that the knife handles lc on the work rack will be evenly contacted on opposite sides by 'theoperating wheelsii on vertical recprocation of -the .Work rack with the frames `|50 and |52.

Operating devices' D` for work 'carrier vReferring now to Figs. 1 and 4, there is' mounted at |92 on the plate 54 between the standardsV 521a-hydraulic cylinder |34 in which is slidable a double-acting piston '|35 (Fig. 1l) the rod |96 of which `is connected at |98 with a bracket 200 (Fig. 4)- which is carried by the cross `bars |58 of the frame |50, and serves `to impart the reciprocatory motion of the piston |95 in the work-rack cylinder `|64 to the `.frame |50.

The prime mover for the oscillation of the frame.|52 is an hydraulic motor 202 (Figs. 4 and 6) which is carried by a housing 204 that is, in turn, mounted in-anysuitable manner on the plate 54 between the standards 52. The `rhydraulic motor 202 Ais of a well known typeA and requires no detaileddisclosure. For. the present purpose, it is sufficient to understand that the drive shaft 206 of the motor 202 turns in one direction on the passage of a liquid under pressure through the motor. The housingA 204 is closed at its open front by a cover 208, and houses agear l2li) (Fig. 6) which is mounted on the motor shaft 206 and is in permanent mesh with another Agear 2li! on a shaft 2|4. Shaft 2|4 is journaled in the housing 204 and cover 208,and carries externally of the housing 204 a disk 2|6 having a crank pin 2|.8 which is received in a vertical groove 223 in the rear ofthe sidevmember |62 of the oscillatory frame-|52. rlhus, the frame |52 and, hence, also the work rack |80 thereon will, on operation of thelhydraulic motor202, be oscillated on the frame-|50, and such oscillation of the frame |52 may take place-uninterruptedly during reciprocation of the other .frame |50.

Controls E for operating wheels Referring now more particularly to-Figs. 41 and 2the rock shafts 12 of the operating wheels 60 have extensions 232 beyond one sideof the base frame 30 and there carry arms 234, respectively, which are provided at adjacent ends with 4followers 2'35, respectively, adapted vto cooperate 4withrnaster cams 238, respectively. The oppositeends of the arms 234 are pivotally connected at 240 with an extension 242 on a cylinderl244 and a piston rod 246, respectively. Rod 246 is carried by a double-acting piston in thefcylinder v244, the opposite ends of which communicate with a source of liquid under pressure through conduits 248 and 250, respectively. When liquid under pressure is admitted through conduit 250 into the right-hand end ofthe cylinder 244, as viewed in Fig. 2, the piston therein Ais forced to the left, with the result that rthe'lower ends of the arms I234 are forced apart and the followers 236 on the otherV ends of the armsf-234 areforced into engagement Awith their respective master cam's2-38. Conversely, the `followers v236 on the verated on bythe operating wheels 60.

arms 234 are Vdisengaged from their respective Vmaster cams 238 when'liquid under pressure is admitted through -conduit 248.

The master cams 238 are accurately positioned on dowel pins 25| on opposite slides V252 and 254, respectively, and are held thereon by screws 253 (Fig. 2l). The slides 252 and 254 are guided for movement to and from each other in a horizontal-dovetail groove 256 in a slide 253 which is, vin turn, guided for vertical movement in a dovetail groove 260 in the sliding bracket |54 -o'f lthe reciprocating frame |50 (Figs. 1 and 2).

The `cam-carrying slides 252 and 254 .are in Ithreaded engagement with oppositely threaded ylengths `252 and 264, respectively, of a spindle 266 which is suitably journaled in forwardly projecting lugs 268 of the vertical slide 253 `and carries at one end a hand wheel 213 withfwhich Ato turn the spindle 265v and thereby adjust the spacing of the master cams 238 in accordance with the width of the knife handles to be op- The .vertical slide 253 is in threaded engagement with `a `vspindle 212 which is held axially immovable in a projecting lug 214 on the adjacent bracket |54 and carries thereabove a hand wheel 216 vwith which to turn the spindle 212 and thereby adjust the master cams 238 in correct vertical position.

gether have the correct side contour of this knife handle, and the master cams 238 are so adjusted, through manipulation of the hand Wheels 210 and 216, that the correct contour portions of these master cams cooperate with the followers 236 on the arms 234 when the corresponding con- .tour portions of the knife handles on the mounted work rack |88 are in operative engagement with the wheels 60. Thus, the Wheels 60, be they trimming or bufling wheels, are on reciprocation of the work between the Wheels 60, positively moved to and from each other in such manner that their peripheries follow the correct contour of the work, thereby preventing excessive abrading of the knife handles, and even correcting the contours of the latter where slightly olf.

Hydraulic control system F The heretofore mentioned hydraulically operated devices |34, 202 and 244 require for their operation a liquid. such as oil, which is put under pressure in a manner hereinafter described by a 'pump 320 (Fig. 11) that is driven by an electric motor 3,22 (Fig. 2) which is mounted on the bottom of the base frame 30. The apparatus further comprises an electric fan motor 324 (Fig. 11) which is used in conjunction with a 'cooler 323 in which the hot oil is on its circuitous path through the apparatus effectively cooled so as to preserve its maximum operating efliciency. The apparatus further comprises a solenoidoperated valve 338 (Fig. 11) which is mounted vthe pump motor 322 and fan motor 324 with yan electric .power source in any suitable manner or in the manner disclosed in our aforesaid pending application Serial No. 38,066, thereby building up oil under pressure in the various oil lines to be described in the apparatus, before the wheel motors 98 and |26 are permitted to run and before the work is permitted to come into operative engagement with the wheels 66. Next, the wheel motors 98 and |26 may be connected with an electric power source in any suitable manner.

At this stage in an initial operating cycle of the apparatus, the pump motor 322, fan motor 324 and the Wheel motors 96 and |26 are operating, but the loaded work rack |36 in the apparatus is still in the raised position shown in Fig. 4. To cause the Work rack |82 to descend at the beginning of an abrading cycle of the apparatus, the circuit of the winding 336 of the solenoid valve 3.30 is closed in any suitable manner or in the manner disclosed in our aforesaid co-pending application Serial No. 38,066. Energization of the winding 336 causes a shift of the solenoid valve 336 from a neutral position to be described into the full-line position shown in Fig. 11, in which the same is conditioned for power reciprocation of the piston |95 in the workrack cylinder |64 in a manner hereinafter described. rihe subsequent reversal at the end of each stroke of the piston |95 in the work rack cylinder |94 is under the control of a pilot valve 640 which is operated by the reciprocating frame |59 in a manner hereinafter described. At the end of an abrading cycle of the apparatus, the circuit of the Winding 336 of the solenoid valve 330 is opened, and the circuit oi the winding 338 of the same valve is closed, in any suitable manner or in the manner disclosed in our aforesaid co-pending application Serial No. 38,066.

Energization of the solenoid winding 338 will cause a shift of the solenoid valve 339 into a position, to be described, in which it will effect the ascent of the work rack |69 to its uppermost or home position in which it Will remain, without being oscillated, until the next operating cycle of the apparatus is started.

On energization of the winding 335 of the solenoid valve 330, the latter is, as previously mentioned, shifted into the full line position shown in Fig. ll, in which it provides communication between conduits 559 and 568, that carry oil under pressure from the pump 320, anda conduit 516 which leads to one end of a control valve 5!2 in which the admitted oil forces the sliding valve 534 into the full-line end position shown in Fig. 1l, against the tendency of a spring 5l6 to move the valve 5M into the opposite end position. When the valve 574 is shifted into this full-line position, oil under pressure from the pump 320 is immediately admitted to the top end of the work rack cylinder |94 by way of conduit 550, a conduit 586, a flow control valve 582, conduits 584 vand 566, a control valve 508 (assuming at this time full-line position in Fig.

-11 for dovvn stroke of work rack piston |95 as hereinafter described) conduit 590, control valve 522, and conduit 592. Oil under pressure is at the same time admitted to the lower end of the work rack cylinder i94'by way of conduit 584 and a preferably interposed pressure control valve 594. Inasmuch -as the exposed cross-sectional area of the piston E95 in the Work rack cylinder |94 is larger at the top than at the bottom thereof, it stands to reason that the total pressure of the oil against the top face 598 of the piston |95 exceeds the total pressure of the oil against the bottom face 600 thereof, with the result that the piston |95 descends and carries the work on the rack |86 between the operating I Wheels 69. The oil in the lower end of the cyliner |94 is, during the descent of the piston |95 therein, by-passed to the top end of the cylinder by way of conduit 594 and interposed valve 594, conduit 566, valve 588, conduit 590, valve 512 and conduit 592.

Simultaneously with the start of the work reciprocation, oil under pressure is also permitted to flow from the pump 320 through the Workoscillating motor 202 by way of the conduits 550 and 580, a conduit 602, a flow control valve 604, a conduit 606, and the motor 202, thence through conduits 608 and 6|0, solenoid valve 330, and conduits 6|2, 6|4 and 566 to an oil reservoir 560 from which the pump 320 draws oil. Thus, the Work rack starts to oscillate at the same time it starts to descend on its rst Work stroke. Simultaneously with the shift of the solenoid valve 339 into the full-line position shown in Fig. 11, oil under pressure from the pump 320 is also admitted to the active side of the wheel pressure cylinder '244 by way of conduit 550, a conduit 620, a flow control valve 622, a conduit 624, a pressure control valve 626, and the flexible hose connection 250. The oil in the opposite side of the same cylinder 244 is then permitted to return to the oil reservoir 560 by Way of the flexible hose connection 248, conduit 6|0, solenoid valve 330, and conduits 6|2, 6|4 and 566. Thus, on energization of the Winding 336 in each operating cycle of the apparatus, and according shift of the solenoid valve 330 into the full-line position shown in Fig, 1l, the cylinders |94 and 244 and the hydraulic motor 202 simultaneously receive oil under pressure, with the result that the work-rack piston will descend for the first time in a cycle, the cylinder 244 and piston therein will bring the operating Wheels 60 under the control of the master cams 238, and the hydraulic motor 202 will oscillate the Work.

Suitably mounted on vertically adjustable brackets 632 and 633 on the slide |56 of the reciprocatory frame |50 (Fig. 3) are two blocks 634, respectively, having projecting lugs 636 and 638, respectively, which are adapted to operate the previously mentioned pilot valve 649 (see also Figs. 7 to 10). The brackets 632 and 633 are 'slidable in a dove-tail groove 635 in the slide |56 (Fig. 3) and are in threaded engagement with axially immovable spindles 637 and 639, respectively, on the slide |56, said spindles 531 and 639 having knobs 64| and 643, respectively, with which'to turn said spindles and thereby adjust the vertical position of the respective brackets 632 and 633. The pilot valve 640 comprises a casing 642 (Fig. ll) and a rotary valve element 644 therein. The valve element 642 extends to the outside of the valve casing 640 and there carries a valve actuator 546 having angularly spaced lingers 648 and 659 which are also spaced horizontally from each other as shown in Fig. 8. The finger 648 of the ,valve actuator 646 is in operative alignment with the lower lug 638, While the other ringer 650 of the valve actuator is in oper ative alignment with the upper lug 636. As previously mentioned, the pilot valve 640 is adapted to control the ilow of oil to and from the top and of the work-rack cylinder |94 so as to reverse the piston |95 therein at the end of each down or upstroke thereof, and this control is operative throughout the time of reciprocation of the work in an operating cycle of the apparatus. The

:vertical adjustability of the lugs 636 and 638 in theapparatuszalso Vaiords a; convenient means not only to Vregulate the .stroke of the :piston `|95; in thefWork-rrack cylinder i942 for the reciprocation of the work, but also to confine the reeiprocation ofjthe piston |95 to diierent regions within the work-rack cylinder |94. Thus, by properly 'adjusting the lugs E38 and 538, the work will, after its` initial descent from uppermost position, be reciprocate'd through' partial. strokes of such length that the work willremain in operative engagement with the operating wheels di! throughout its reciprocation, and will at the end of` an abrading cycle of the apparatus .be raised to its uppermost position. in-Whichit is out :oi operative engagement with thewheels iiiA and 'may heremoved from the apparatus. Also, the described adjustability of the lugs 636 and i333 adapts the apparatus for trimming or bufiing knife handles of different length, as willv be readily understood.

The angular positionthe Valve actuator @et and, hence, of the rotary'element tfll in the pilot valve `641i!l depends :solely on the preceding downward or upward stroke of the reciirocatory frame |50. Thus, when the work-'carrying frame lilo descends, the upper lug 6.36 thereon; will', knear the lower limit of the down stroke of. saidv frame asdeterminedby the adjustment of :lug 535, engage the nger 659 of the Valvefaetuator 6428 and turn the latter from .the position shown inV '7 into' that shown in Fig. 9, in which nger @35d is out' of the 'path of the lugSB-., and the other finger 8718" -isflin the path of the other lug on 'the following upstroke of the frame 55d.. The lug 63B will engage finger 648 ofthe Valve actuator 6:46, and turn the latter back to the position shown in Fig. 10, when the work-carrying frame is near the upper limit-of its following partial upstroke as determined by the adjustment oi. the lug B38. In the position .of the'pilot' valve @ed as shown in Figs. '7, 9 and 11, the same provides communication between the pump .and the left hand end of valve 583- (Fig. lll) by way 'of conduit 550, a passage 569-in the valve element 6M Aand a conduit` 682. The `right hand end .of Valvefili is then exhausted byway oi'conduit' Sdi., another passage 681i through the rotary element Si@ 'in the pilot 'Valve '51613, a conduit 5119:, .and theconduits 514 and 566. In consequence of the describedadmittance ofoilunder pressure to the valves 588, the latter assumes the full-lineposi tion shown in Fig.. 1l, in which oil undervpressure isadmitted to they top end' of the work-racl cylinder |94, as previouslydescribed; Hence, the workerack piston |195 will, `in an. operating cycle of `the apparatus, descend after each partial up* stroke thereof, every time the pilot `valve '54d 'is shifted into the position-shown in Figs. 'I and 11', except when the latter is thus shifted for the last time in each operating cycle, as' willb'ecome obvious hereinafter. pilot Valve 648 'into the positionshorm .in Fig.. 9 on each descent of theLwor-kmcar-rying trarne tt, the'va'ive element 6M ofthe pilot Valve will intercept communicationfbetween the conduits. 559'and 6132, `and instead provide communication between conduit'fll and conduit 15.64 which 'leads to the right handend of the valveEilB as viewed in Fig. 1`1`. Admit/tance. of oil under pressure to the right hand end of the valve 538 results in a shift of theyalyeelement di@ therein. from the full-line position into the dot-and-dash line position. The lefthandend ofthe vali/e588 is thenexhausted by Way of: conduit 6.82', passage itil in the rotary el'eme'ntllll of the pilot valve ddii, and. conduits 610; t I 4- and .56 6; The valuel element'dof valve l0 588 now' being. in' the dot-and-dash line position in` Fig. V11, the same permitsl the exhaust' of the top end `vof the work-rack cylinder |94, resulting in an upstroke of the piston therein because thelower end of the cylinder remains subjected v to oil under pressure. The upper end of the work-rack cylinder |94 is then exhausted by way of conduit 592, valve `512,'condui`t 5st, Valve 588, and conduit 556. When theascending 'fra-me: |59 approaches the adjusted'upperv limit .its partialy stroke, the lug 638 engages the alignednger 96.18 of the Valve actuator `tilt and'turns-t-hef pilotvalve 840 back tothe position shown inE Figs. 1v and 1'1, resulting inthe next descentot then/urk.` The work-rack :piston-95, and, hence, the` frames E58 `and |52 las well as ther-work rack .l 8.9,. ane thus reoiprocated. until the winding 3.38 of ther solenoid valve 339 is deenerg-ized andthe windingv 338-thereofis energized. When the1 winding 338' of the solenoid val-ve is energized, the-solenoid valve- 338- is shifted intothe doteand-dashline position 'sh-own in Fig. 11., in which oilfunder pressure inthe cond-uit isadm-itteolf throughthe valve 33@ andy the conduits ViililvandS88-"toithe work-oscillating motor 292,V thereby immediately locking the latter hydraulically. Oil; under pressure in the lconduit M0 .isthen alsof-admitted through the hose connection `2i|8rto1the wheel pressure cylinder -2-44 -forv eiecting 'separation.orf-I the operating wheels Gil and according disengage` ment of theffollowers on thesarnis 234 `frorntheir respect-ive master carns. The/other side.y of. the wheel-pressure cylinder 291iv isi thenA exhausted by way of the hose -connectionwZ-5s'l, value 2-,:a conduit 6.7512 and condu-itd, thespring-urged valve element 625| .in the. valve .52.5 being. then subjected at thel bottom to oil. under pressurein the .conduit 5|!! and, vin consequence, raised: suflioiently to provide communication between they hose connection 12.50. andl theconduit 51.2..: Energization .ot the winding iti-18 ofthe solenoidl val-ve 339 at the end ofan abradingor operating. cycle. yof the apparatus` and the cor-responding. shift ofthe `solenoid valve' 33|)e into vthe dot-.and-

. dash linepositionshown in Eig. 1.1., resultfalso in the Aexhaust of the left handi end of the Valve-- 512, so that the valve elements514, therein may under. the'force of the `spring 518s move into the dot-an'd-dash -linelposition in Fig. 1l.. Valve. A512- is thus exhausted by way of -conduitliL .solenoid ValVe.330.-, and conduits 1S12, 6M land 555.. Valve 512 now assuming the dot-and-dashlineposition.

shown in Fig. l1, the top end of the -work--rack cylinder .|94- is exhausted4 by way of conduit. 592, valve 512, a conduit 618 andfconduit -568- The lower endof the cylinder `|94 issubjected to oil under pressure as long as the pump-32!! operates, Whereforel the work-rack. piston` |95n and.- partsconnected 4therewith are returned to their uppermost positiona't the endnof 'each-operating cycle: of the apparatus. Should the operator stopthe apparatus for' vany lengtlroi time, i. e. byalso stopping the pump motor 3.22, the oil.. in, the

various lines' supplied by thepu-mp-Sgo wil-l then.

be no longer under pressurawithf the'result. that the' valve element in their/awe 5-9iis .springurgedinto a position'iny which` it-blocks conduit.

585.1, whereby the oil in thelower end of' they/.otk rack cylinder |94 becomes` locked-therein .and retains the piston |95 in `Vits uppermostposition while. the apparatus-is-stoppedoompletely.k

The sliding `valve elem-ent- 685, inthe solenoidvalve 3310 is, whenever both windings. 33tand. 338thereofareileenergizedforoedby balanced` springs (not shown) intothe lectora-mentioned Vvthe conduit 568 which is in open communication with the pump 320.

Rsum of operation Assuming that the present apparatus is at a complete standstill and that a loaded Work rack |80 is suspended from the oscillatory frame |52 in the manner best shown in Fig. 4, the operator will then initiate an operating cycle by rst closing the circuit of the pump motor 322. Operation of the pump 320 results in the build-up of oil under pressure in the various oil lines that lead to the hydraulic devices of the apparatus. However, these oil lines are at this initial stage in an operating cycle effectively blocked from their respective hydraulic devices so that the continuously flowing oil from the pump is at this time returned to the oil reservoir 560 past a check valve 100 and through a conduit 102. At this time also the circuit of the motor 324 for the oil cooler 326 is closed. Next, the circuits of the wheel motors 98 and |25 are closed, whereupon the circuit of the winding 336 of the solenoid valve 330 is closed` Immediately on closure of the circuit of the winding 336 of the solenoid valve 330, the latter is shifted into the full-line position shown in Fig. 1l, in which the same effects swinging movement of the operating wheels 60 and their follower arms 234 into operative relation with the master cams 238, and further effects reciprocation and oscillation of the work to permit the operating wheels 60 to perform the desired abrading operation on the opposite side edges of the knife handles while the same remain in operative engagement with the wheels 6U. More particularly, the solenoid valve 330 will, when inthe full-line position shown in Fig. l1, effect a shiftof the control valve 512 into the full-line position, in which oil under pressure is admitted through the latter to the top end of the work rack cylinder |94 to effect the first and full down stroke of the work from uppermost position. The solenoid valve 330 will then also provide communication between the exhaust conduits 608 and 6|0 of the work oscillating motor '202 and the exhaust conduits 6|2, 6|4 and 566, thereby unlocking the motor 202 and permitting the same to be operated by oil under pressure flowing through the conduits 550, 560 and 602, flow-control valve 604 and conduit 606 (Fig. 11). The solenoid valve 330 will then also permit the exhaust of the right hand side of the wheel pressure cylinder 244 (Fig. 11), with the result that oil under pressure will now be admitted into the other side of the cylinder 244 and the follower arms 234 of the operating wheels 60 will be brought into operative relation with the master cams 238. The lower end of the work-rack cylinder |94 is permanently subjected to oil under pressure from the pump 328 as long as the latter operates, as has been previously explained. However, on initial admission of oil under pressure to the upper end of the cylinder |94, in consequence of the shift of the valve 512 into the full-line position shown in Fig. 1l, the oil displaced from the lower end of the cylinder |94 by the descending piston |95 therein is bypassed to the top end of the same cylinder through conduit 584 with the interposed valve 594, conduit 586, valve 588, cnduit'580, valve 512, and conduit 592.

The pilot valve 640 assumes the position shown in Figs. '1 and 11 when the frame |50 with the work thereon starts to descend from uppermost position for the first and only time in an operating cycle of the apparatus. This is due to the fact that the pilot valve has been shifted into this position by the frame |50 on its ascent into uppermost position at the end of the preceding cycle of operation of the apparatus. Toward the end of the initial and full downward stroke of the frame |50, the lug 636 thereon will shift the pilot valve 640 from the position shown in Fig. '7 into the position shown in Fig. 9, in which the same admits oil under pressure from the conduit 550 through the conduit 664 into the right hand end of the valve 583, causing thereby a shift of the latter from the full-line position into the dotand-dash line position shown in Fig. 1l, in which the top end of the work-rack cylinder |94 is permitted to exhaust by way of conduit l592, valve 512, conduit 588, valve 588, and conduit 566. The work-rack piston will then reverse its stroke and move upwardly, this by virtue of the fact that the lower end of the work-rack cylinder |94 is continuously subjected to oil under pressure from the pump 328. When the frame |50 then nears the adjusted limit of its partial upstroke, the lug 638 thereon will engage the finger 648 of the valve actuator 646 and turn the pilot valve 840 back into the position shown in Figs. '1 and l1, in which the same effects a renewed down stroke oi the work-rack piston |95, as will be readily understood. Thus, the work will continue to reciprocate and oscillate while remaining in operative engagement with the wheels 66, until the circuit of the winding 336 of the solenoid valve 338 is opened and the circuit of the winding 330 thereof is closed. Closure of the circuit of the winding 338 causes a shift of the solenoid valve 338 from the full-line position into the dot-anddash line position (Fig. 1l) in which conduit 510 is exhausted by way of valve 330 and the conduits 6|2, 6|4 andV 566, with the result that valve element 514 in the valve 512 is spring-urged into the dot-and-dash line position (Fig. 11) in which the top end of the work-rack cylinder |84 is permitted to exhaust by way of conduit 502, valve 512, and conduits 618 and 566. When in the dotand-dash line position, the solenoid valve 330 also provides communication between the conduit 568 that carries oil under pressure, and the conduit 6|0 and branch conduit 688, thereby causing the work-oscillating motor 202 to become hydraulically locked, and causing the wheel pressure cylinder 244 and piston therein to withdraw the follower arms 234 of the operating wheels 60 from their respective master cams 238, all as previously described in detail.

While we have shown and described a preferred embodiment of our invention, it will be understood that various changes may be made in the present invention without departing from the underlying idea or principles of the invention within the scope of the appended claims.

Having thus described our invention, what we claim and desire to secure by Letters Patent, is:

l. Apparatus of the character described, comprising a reciprocatory carrier,

cylinder, said piston having one face fully exposed in said cylinder and having its opposite face only partially exposed, said opposite face having a projecting rod connected with said carrier for reciprocating the latter, a conduit providing communication between that cylinder side in which said a stationaryY cylinder, a double-acting piston slidable in said other piston face is exposed .anda source of fluid underv pressure, va valve casing -having `an exhaust port and rst and second ports in communication with said conduit and the other cylinderside, respectively, a plunger slidable in said casing into rst and second positions in which to'provide'communication between said'first and second ports and between said second and exhaust ports, respectively, and a device actuated by the reciprocating carrier at the yends of strokes thereof toward and away from said cylinder for shifting said `plunger into said first and second positions, respectively, said device. comprising hydraulic valve means.

2. Apparatus as set forth in claim l, in which said device comprises a stationary valve having first, Asecond and thirdport's in communication with said conduit and the opposite ends, respectively, of said valve casing, and a valve element therein shifta'ble into positions in which to provide communication between said first and second ports. and between said rst and third ports, .respectively, and two elements on said carrier spaced in the direction of reciprocation of the latter and adapted' to shift said valve element into said positions, respectively, at the ends of consecutive strokes, respectively, of said carrier.

`3. Apparatus 'as set forth in claim 1, in which said device comprises a stationary Valve having first, second and third ports 'in communication withsaid conduit and ther opposite ends, respectively, of'sai'd -valve casing, and a valve element therein shiftable into positions in which to provide communication between said first and second .ports and .between said first and third ports, respectively, and' ltwo elements on said carrier spaced inthe direction' of reciprocation of the latter and adaptedto shif-t lsaid valve element into said positions, respectively, at the ends of consecutive strokes, respectively, of said carrier, one of said elements being adjustablev on said carrier inthe-'direction 'of reciprocation of the latter ,tovary the stroke of said. carrier.

e. .Apparatus of the character described, cornprising a reciprocatory carrier, a stationary cylinder, a double-acting piston slidable in said cylinder, said piston having one face fully exposed in said cylinder and having its opposite face only partially exposed, said opposite face having a projecting rod connected with saidV carrier for reciprocating the latter, a conduit providing communication between that cylinder side in-which said other piston face is exposed and a source of fluidr under pressure, a valve casing having an exhaust port and first and second ports in communication with said conduit and the other cylinder side, respectively, a plunger slidable in said casing into first and second poH sitions in .which to provide communication between said first and second ports and between said second and exhaust ports, respectively, a device actuated by the reciprocating carrier after each partial stroke thereof toward; and after each stroke thereof away from, said cylinder for shifting said plunger into said first and second positions, respectively, said device comprising hydraulic valve means and means other than said valve casing for exhausting said other cylinder side.

5. Apparatus as set forth in claim 4, in which said device comprises a stationary valve having first, second and third ports in communication with said conduit and the opposite ends, respectively, of said valve casing, and a valve element therein shiftable into positions in which to provide communication between said first and second ports and between said first and third ports,Y

first, second and third ports in communicationv with said conduit and the opposite ends, respectively, of said valve casing, and a valve element therein shiftable into positions in which to' provide communication between said first and second ports and between said first and third ports, respectively, and two elements on said carrier spaced in the direction of reciprocation of the latter and adapted to shift said valve element into said positions, respectively, at the ends of consecutive strokes, respectively, of said car rier, one vof said elements being adjustable on said carrier in direction of reciprooation of the latter to vary the partial stroke of said car-l rier.

7. Apparatus as set forth in cla-im e, in which said device comprises a stationary valve having first, second and third ports in communication with said conduit and the opposite ends, respectively, of said valve casing, and a valve element therein shiftable into positions in which to provide communication between said first and second ports and between said first and third ports, respectively, and two elements on said carrier spaced in the direction of reciprocati'on of the latter and adapted to shift said valve element into rsaid, positions, respectively, `at the ends of consecutive strokes, respectively, of said carrier, said elements being individually adjustable on said carrier in the direction of reciprocation of the latter to vary the partial stroke of said car,- rier and/or shift the regi-on within which said carrier reciprocates.

Apparatus of the character described, comprising a reciprocatory carrier, a stationary cylinder, a double-acting piston slidable in said cylinder, said piston having one face fully exposed `in said cylinder and having at its other` face a projecting rod connected with said carrier for reciprocating the latter, a first conduit providing communication between that cylinder side in which'said other piston face is exposed and a source of fluid under pressure, another conduit branching from said first conduit and leading to the other cylinder side, a valve casing having an exhaust port and being interposed in said. branch conduit, a plunger slidable in said casing into first and second positions in which to provide communication through said branch conduit and between said exhaust port and other cylinder side, respectively, a device actuated by said carrier after each partial stroke thereof toward, and after each stroke thereof away from, said cylinder for shifting said plunger into said first and second positions, respectively, another valve having an exhaust port and being also inn terposed in said branch conduit between said other cylinder side and said valve casing, and a valve element in said valve slidable into first and second positions in which to provide communication through said branch conduit and between said other cylinder side and exhaust port of said other valve, respectively, and another device for sliding said valve element into either of said positions.

9. Apparatus as set forth in claim 8, in which said valve element is in said second position thereof at one end of said other valve, and said other device comprises means in said other valve yieldingly urging said valve element into said second position, a third valve having an exhaust port and third and fourth ports in communication with said iiuid source and said one end of said other valve, respectively, and another valve element in said third valve shiftable into positions in which to provide communication between said third and fourth ports and between said fourth and exhaust ports, respectively, of said third valve.

10. Apparatus as set forth in claim 8, in which said valve element is in said second position thereof at one end of said other valve, and said other device comprises means in said other valve yieldingly urging said valve element into said second position, a third valve having an exhaust port and third and fourth ports in communication. with said fiuid source and said one end of said other valve, respectively, another valve element in said third Valve shiftable into positions in which to provide communication between said third and fourth ports and between said fourth and exhaust ports, respectively, of said -third valve, two solenoid windings associated with said other valve element and adapted, when energized, to shift the latter into said positions, respectively, and a separate circuit for each solenoid winding, including a switch for opening and closing said circuit.

11. Apparatus of the character described, comprising a first frame, a second frame mounted on said rst frame for oscillation in a certain direction, said first frame being reciprocable transversely of the direction of oscillation of said second frame, a stationary cylinder, a double-acting piston slidable in said cylinder, said piston having one face fully exposed in said cylinder and having at its other face a projecting rod connected with said first frame for reciprocating the latter, means for oscillating said second frame on said rst frame when the latter reciprocates, said means including a fluid motor having an inlet and an outlet, a iirst conduit providing con munication between that cylinder side in which said other piston face is exposed and a source of uid under pressure, a second conduit branching from said rst conduit and leading to the inlet of said iiuid motor, a third conduit also branching from said first conduit and leading to the other cylinder side, a valve casing having an exhaust port and being interposed in said third conduit, a plunger slidable insaid casing into first and second positions in which to provide communication through said third conduit and between said exhaust port and other cylinder side, respectively, a device actuated by said first frame after each partial stroke thereof toward and after each stroke thereof away from, said cylinder for shifting said plunger into said rst and second positions, respectively, another valve having an exhaust port and being also interposed in said third conduit between said other cylinder side and said valve casing, and a valve element in said valve slidable into rst and second positions in which to provide communication through said third conduit and ybetween said other cylinder side and exhaust port of said other valve, respectively, said valve element is in said second position thereof at one end of said other valve, means in said other valve yieldingly urging said valve element into said second position, a third valve having another exhaust port and third, fourth and fifth ports in communication with said uid source, said one end of said other valve, and the outlet of said fluid motor, respectively, and another valve element in said third valve shiftable into a first position in which to provide communication between said third and fourth ports and between said fifth and other exhaust ports, and also shiftable into a second position in which to provide communication between said fourth and other exhaust ports and between said third and fifth ports.

ROLLAND G. HALL. STEWART M. HILL.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS 

